Potentially in places, but not everywhere out there. By wifi i assume you mean cellular data, wifi in the wild would require them to stumble on cottage that has a router with wifi and likely to know the password.
I've been up there, both for work and for pleasure (long canoe tripping), and you wont get very much service with rogers, only 2g in places few and far between. With bell you can 3g in town pretty consistently, outside of town it drops off fast, and places with good reception again become few and far between, just a bit better than bell's competitors.
Being able to consistently use the internet, check SM, google stuff, or download maps would be incredibly limited on either service, because cellular data and LTE only work in a very small area around the towns, once out in the bush you will likely not get cell data at all.